Highly moisture-resistant PLA-coated paper for food packaging

Abstract

The utility model relates to food packaging technical field, and disclose a kind of high moisture resistance PLA film-coated paper applied to food packaging, including kraft paper base material, the surface of kraft paper base material is provided with moisture barrier layer, and the upper of moisture barrier layer is provided with antiskid part, the inside of kraft paper base material is provided with reinforcing rope core;Kraft paper base material includes kraft paper corrugated core, the below of kraft paper corrugated core is provided with lower kraft paper straight plate, and the upper of kraft paper corrugated core is provided with upper kraft paper straight plate;Antiskid part includes wear layer being set in the top of moisture barrier layer, the upper of wear layer is provided with grid layer.The utility model is provided with antiskid part, wear layer effectively resists scraping, protects the printing pattern below, and the grid layer formed by embossing process greatly increases the roughness of packaging surface, to generate strong friction, realize excellent antiskid effect, this design combines wear resistance function and antiskid function into one, structure is stable, without shedding risk.

Description

Technical Field

[0001] This utility model relates to the field of food packaging technology, specifically a high moisture barrier PLA coated paper used in food packaging. Background Technology

[0002] With increasing environmental awareness, the food packaging industry is actively seeking sustainable alternatives to traditional plastic packaging materials. Polylactic acid (PLA), a bio-based biodegradable material derived from renewable plant resources (such as corn and cassava), has become an ideal candidate. Currently, existing technologies using PLA-coated paper for food packaging have achieved degradability to a certain extent.

[0003] An existing patent (publication number: CN206997565U) discloses a multi-layer composite PLA coated paper, including a cardboard layer and a PLA coated layer. The cardboard layer has reinforcing layers on both its upper and lower surfaces. The composite paper material, consisting of the cardboard layer and reinforcing layers, is covered with a PLA coated layer. The cardboard layer has a wavy cross-section, and the upper and lower layers are arranged in a cross shape, increasing its thickness and improving its thermal insulation. Combined with the reinforcing layers, this enhances the strength of the composite PLA coated paper. The PLA coated layer on the outer surface provides waterproofing, oil resistance, and resistance to high and low temperatures, and is also biodegradable and environmentally friendly. However, in practical use, product information is printed on the cardboard layer, and the printed patterns on the outside of the packaging lack effective protection, making them easily worn during transportation and handling, thus affecting the brand image. Utility Model Content

[0004] The purpose of this invention is to provide a high moisture-barrier PLA coated paper for food packaging in order to solve the technical problem of the lack of effective protection for printed patterns in the above-mentioned multi-layer composite PLA coated paper.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A high moisture-barrier PLA coated paper for food packaging includes a kraft paper substrate, a moisture-barrier layer is provided on the surface of the kraft paper substrate, and an anti-slip part is provided above the moisture-barrier layer. A reinforcing rope core is provided inside the kraft paper substrate.

[0007] The kraft paper substrate includes a kraft corrugated core, a lower kraft straight plate is provided below the kraft corrugated core, and an upper kraft straight plate is provided above the kraft corrugated core.

[0008] The anti-slip part includes a wear-resistant layer disposed on top of the moisture-proof layer, and a mesh layer disposed above the wear-resistant layer.

[0009] As a further embodiment of this utility model: the corrugated cowhide core has a W-shaped structure, and the lower cowhide straight plate, the corrugated cowhide core, and the upper cowhide straight plate are glued and fixed from top to bottom.

[0010] As a further improvement of this utility model: the reinforcing rope core is set on the crest of the corrugated leather core, and the reinforcing rope core is a cotton rope.

[0011] As a further embodiment of this utility model: the reinforcing rope core is evenly distributed at equal intervals along the interior of the kraft paper substrate, and the diameter of the reinforcing rope core is adapted to the thickness of the kraft paper substrate.

[0012] As a further embodiment of this utility model: the moisture barrier layer includes a PLA coating layer covering the lower layer of the kraft paper substrate and a waterproof film covering the upper layer of the kraft paper substrate.

[0013] As a further embodiment of this utility model: the upper surface of the kraft paper substrate is the printing surface, and the waterproof film covers the upper surface of the kraft paper substrate.

[0014] As a further improvement of this utility model: the waterproof film is a PLA-based waterproof film, and the wear-resistant layer covers the surface of the waterproof film.

[0015] As a further improvement of this utility model: the wear-resistant layer is made of transparent material, and the mesh layer is made by embossing the wear-resistant layer on the incompletely cured wear-resistant layer using a roller with a mesh texture.

[0016] The beneficial effects of this utility model are:

[0017] 1. This utility model effectively improves the compressive and bending stiffness of the packaging paper by using a W-shaped corrugated kraft paper substrate and an internal reinforcing rope core in synergy.

[0018] 2. This utility model features an anti-slip part and a wear-resistant layer that effectively resists scratches and protects the printed pattern underneath. The grid layer formed by the embossing process greatly increases the roughness of the packaging surface, thereby generating strong friction and achieving excellent anti-slip effect. This design combines wear-resistant and anti-slip functions into one, with a stable structure and no risk of falling off. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This is a bottom view of the structure of this utility model;

[0021] Figure 3 This is a half-sectional structural diagram of the moisture-barrier layer of this utility model;

[0022] Figure 4 This is a schematic diagram of a half-section of the present invention;

[0023] Figure 5 This is a schematic diagram of the kraft paper substrate structure of this utility model;

[0024] In the diagram: 1. Kraft paper substrate; 101. Kraft corrugated core; 102. Lower kraft straight board; 103. Upper kraft straight board; 2. Moisture barrier layer; 3. Anti-slip part; 301. Wear-resistant layer; 302. Mesh layer; 4. Reinforcing rope core. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Example 1:

[0027] Example 1

[0028] like Figures 1 to 5 As shown, a high moisture-barrier PLA coated paper for food packaging includes a kraft paper substrate 1, a moisture-barrier layer 2 disposed on the surface of the kraft paper substrate 1, and an anti-slip part 3 disposed above the moisture-barrier layer 2. A reinforcing rope core 4 is disposed inside the kraft paper substrate 1. The kraft paper substrate 1 includes a kraft corrugated core 101, a lower kraft straight board 102 disposed below the kraft corrugated core 101, and an upper kraft straight board 103 disposed above the kraft corrugated core 101. The anti-slip part 3 includes a wear-resistant layer 301 disposed on top of the moisture-barrier layer 2, and a grid layer 302 disposed above the wear-resistant layer 301.

[0029] Furthermore, the kraft paper corrugated core 101 has a W-shaped structure, and the lower kraft paper straight board 102, the kraft paper corrugated core 101, and the upper kraft paper straight board 103 are glued and fixed from top to bottom. The kraft paper substrate 1 adopts a corrugated structure, which is composed of the upper kraft paper straight board 103, the W-shaped kraft paper corrugated core 101, and the lower kraft paper straight board 102. This structure itself can provide excellent stiffness and cushioning performance.

[0030] Furthermore, the reinforcing rope core 4 is set on the crest of the kraft paper corrugated core 101. The reinforcing rope core 4 is made of cotton rope and is evenly distributed at equal intervals along the interior of the kraft paper substrate 1. The diameter of the reinforcing rope core 4 is adapted to the thickness of the kraft paper substrate 1. The reinforcing rope core 4 is evenly set on the crest of the kraft paper corrugated core 101. The cotton rope is like countless tiny reinforcing ribs embedded in the corrugated structure. When the packaging paper is subjected to vertical pressure, they can effectively prevent the corrugated structure from being crushed, greatly improving the compressive strength and overall load-bearing capacity of the material. The synergistic effect of the W-shaped corrugated structure and the internal reinforcing rope core 4 effectively improves the compressive and bending stiffness of the packaging.

[0031] Example 2

[0032] In this embodiment, the moisture barrier layer 2 includes a PLA coating layer covering the lower layer of the kraft paper substrate 1 and a waterproof film covering the upper layer of the kraft paper substrate 1. The upper surface of the kraft paper substrate 1 is the printing surface, and the waterproof film covers the upper surface of the kraft paper substrate 1. The moisture barrier layer 2 is composed of an inner PLA coating layer and an outer PLA-based waterproof film, forming a double barrier structure.

[0033] Furthermore, the waterproof membrane is a PLA-based waterproof membrane, with a wear-resistant layer 301 covering the surface of the waterproof membrane. The outer PLA-based waterproof membrane covers the upper cowhide straight plate 103, which effectively resists the intrusion of water vapor from the external environment. The inner and outer PLA-based waterproof membranes and the PLA coating layer work together to form a highly moisture-resistant sealed environment, significantly reducing the overall water vapor permeability.

[0034] Furthermore, the wear-resistant layer 301 is made of transparent material, and the mesh layer 302 is formed by embossing the uncured wear-resistant layer 301 with a roller with a mesh texture. The wear-resistant layer 301 can be a water-based polyurethane or acrylic resin coating. This layer can effectively resist scratches and protect the printed pattern underneath. Through the embossing process, the mesh layer 302 is formed by pressing the uncured wear-resistant layer 301 with a roller with a mesh texture. This mesh structure greatly increases the roughness of the packaging surface, thereby generating strong friction and achieving excellent anti-slip effect. This design combines wear-resistant and anti-slip functions into one, with a stable structure and no risk of falling off.

[0035] Working principle: The moisture barrier layer 2 consists of an inner PLA coating layer and an outer PLA-based waterproof film, forming a "double barrier" structure. The inner PLA coating layer directly covers the lower cowhide plate 102, and its main function is to prevent moisture and oil inside the food from migrating outwards, while providing a clean heat-sealing interface to ensure the airtightness of the packaging bag. The outer PLA-based waterproof film covers the upper cowhide plate 103, and its function is to effectively resist the intrusion of moisture in the external environment, such as condensation in a refrigerated environment. The two PLA-based materials work together to form a highly moisture-barrier sealed environment, significantly reducing the overall water vapor permeability.

[0036] The anti-slip part 3 is integrated into the outermost layer of the packaging. First, a transparent wear-resistant layer 301 is coated on the PLA-based waterproof film. This layer can effectively resist scratches and protect the printed pattern underneath. Through an embossing process, a grid layer 302 is formed on the surface of the incompletely cured wear-resistant layer 301 using a roller with a grid texture. This grid structure greatly increases the roughness of the packaging surface, thereby generating strong friction and achieving excellent anti-slip effect. This design combines wear-resistant and anti-slip functions into one, with a stable structure and no risk of falling off.

[0037] The kraft paper substrate 1 adopts a corrugated structure, which is composed of an upper kraft straight board 103, a W-shaped kraft corrugated core 101, and a lower kraft straight board 102. This structure itself can provide excellent stiffness and cushioning performance. Reinforcing rope cores 4 are evenly arranged on the crests of the kraft corrugated core 101. These rope cores are like countless tiny "reinforcing ribs" embedded in the corrugated structure. When the packaging is subjected to vertical pressure, they can effectively prevent the corrugated structure from being crushed, greatly improving the compressive strength and overall load-bearing capacity of the material.

[0038] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0039] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A high moisture-barrier PLA coated paper for food packaging, comprising: Kraft paper substrate (1), characterized in that: a moisture barrier layer (2) is provided on the surface of the kraft paper substrate (1), and an anti-slip part (3) is provided above the moisture barrier layer (2), and a reinforcing rope core (4) is provided inside the kraft paper substrate (1); The kraft paper substrate (1) includes a kraft corrugated core (101), a lower kraft straight plate (102) is provided below the kraft corrugated core (101), and an upper kraft straight plate (103) is provided above the kraft corrugated core (101). The anti-slip part (3) includes a wear-resistant layer (301) disposed on top of the moisture barrier layer (2), and a mesh layer (302) is disposed above the wear-resistant layer (301).

2. The high moisture-barrier PLA coated paper for food packaging according to claim 1, characterized in that: The corrugated cowhide core (101) has a W-shaped structure, and the lower cowhide straight plate (102), the corrugated cowhide core (101), and the upper cowhide straight plate (103) are glued and fixed from top to bottom.

3. The high moisture-barrier PLA coated paper for food packaging according to claim 2, characterized in that: The reinforcing rope core (4) is set on the crest of the corrugated core (101) and the reinforcing rope core (4) is a cotton rope.

4. The high moisture-barrier PLA coated paper for food packaging according to claim 3, characterized in that: The reinforcing rope core (4) is evenly distributed at equal intervals along the interior of the kraft paper substrate (1), and the diameter of the reinforcing rope core (4) is adapted to the thickness of the kraft paper substrate (1).

5. The high moisture-barrier PLA coated paper for food packaging according to claim 1, characterized in that: The moisture barrier layer (2) includes a PLA coating layer covering the lower layer of the kraft paper substrate (1) and a waterproof film covering the upper layer of the kraft paper substrate (1).

6. The high moisture-barrier PLA coated paper for food packaging according to claim 5, characterized in that: The upper surface of the kraft paper substrate (1) is the printing surface, and the waterproof film covers the upper surface of the kraft paper substrate (1).

7. The high moisture-barrier PLA coated paper for food packaging according to claim 6, characterized in that: The waterproof membrane is a PLA-based waterproof membrane, and the wear-resistant layer (301) covers the surface of the waterproof membrane.

8. The high moisture-barrier PLA coated paper for food packaging according to claim 7, characterized in that: The wear-resistant layer (301) is made of transparent material, and the mesh layer (302) is made by embossing the wear-resistant layer (301) with a roller with a mesh texture on the not fully cured wear-resistant layer (301).

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